Quick Open Cover

[gilsonnb]

I am developing a project to "Quick Open Cover" and would like to know which standard to follow or even a book. There's something written in ASME? Will be mounted on a simplex filter with 3.5 MPa of pressure and temperature of 200 ° C, Filter Material: ASTM A 351 CF8 (Cast).
Please help me.

 

[gilsonnb]

Unclesyd,

What I need is a fast opening cap in simplex filters, like this:

http://www.fdpp.com/SimplexIndex.htm

http://www.heaps.co.uk/OM Instructions/PFSimplex.pdf

Some items that you sent me are very interesting, but it is what I need.

 

[unclesyd]

Your small diameter is good and bad it precludes certain approaches but makes some others possible.
The one thing that prevents you from using a yoke type closure is they require the use of an O-ring to seal and your specified temperature takes you out the O-ring territory. With your small diameter a yoke would be no problem pressure wise if there is some type self-energized metal gasket that one could used.

The reason I suggested the metal seated pipe union is that it readily available and allowable code wise. To me it allows you use a nut of different material and any type lubricant to alleviate potential galling problems with a screwed connection on SS.

It would be possible to use the seat design of the union thread piece, either the metal to metal or the O-ring seal design with a pressure energized metal O-ring and closure using the union blank cap. The closure force could then be applied by a yoke and screw instead of the union nut. There are several possibilities to mount the yoke, trunnions , split clamp, welded lugs on the filter body, screwed collar using the threads on the union thread piece.

Even the yoke clamp here depends on O-rings to seal so the temperature is limited by the O-ring compatibility with the process fluid. Pressure is to Class 1500.

http://www.islipflowcontrols.com/images/products/brochures/fabricated/FabStrainers_cat_21-22.pdf

 

[SnTMan]

Metal "O-ring" gaskets:

http://www.helicoflex.com/ViewProduct?product=514

Regards,

Mike

 

[unclesyd]

Here is another possibility for a gasket with a metal to metal connection in place of an metal O-ring.
You might want to look at the Selco Gasket it is blowout proof and fire safe.

http://www.selcoseal.com/

 

[SnTMan]

All kinds of metal / graphjite gaskets available, if a conventional gasket can be used. See Flexitallic, Garlock, etc.

Regards,

Mike

 

[dmac21]

The style of quick opening closure that you are looking is frequently refered to as being the 'bridge type' and cannot be made to fully meet the intent of UG-35. Development of design formulas etc per code are difficult to produce and, with the length of time that these closures have been around, that the original designs were based on some type of proof testing criteria such as a lime was proof test.
A 200 deg C design temp is not an issue, Viton A seals are rated for continous operation at 204 deg C and you have other options such as Aflas.

 

[GenB]

I do not see aproblem designing a 2" filter w/quick clossure as defined in the samples.
The cyl and plate can possible be calculated but the bolting/closure may not and proof will be needed.

1- you do not need ASME stamp for it.
2 if ASME VIII-1 stamp needed: you should have it Proof tested, all materials have to comply w/the Code.
other: have the design cert by a proffessional eng experienced i the design and stamp it with ASME div2.